Ch. 4 Section 1 Objectives Name the scientists who first observed living and nonliving cells. Summarize the research that led to the development of the.

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Presentation on theme: "Ch. 4 Section 1 Objectives Name the scientists who first observed living and nonliving cells. Summarize the research that led to the development of the."— Presentation transcript:

1 Ch. 4 Section 1 ObjectivesName the scientists who first observed living and nonliving cells.Summarize the research that led to the development of the cell theory.State the three principles of the cell theory.Explain why the cell is considered to be the basic unit of life.

2 Section 1 The History of Cell BiologyThe Discovery of CellsSection 1 The History of Cell BiologyAll living things are made up of one or more cells.A cell is the smallest unit that can carry on all of the processes of life.

3 Ch. 4 Cell Discovery cont. Hooke LeeuwenhoekRobert Hooke discovered cells in slices of cork.LeeuwenhoekAnton van Leeuwenhoek was the first to observe living cells in microorganisms.

4 Cell Theory Development (Schleiden, Schwann, and Virchow)1838 Matt Schleiden: All Plants are composed of cells1839 Theodor Schwann: All Animals are composed of cells1847 Rudolf Virchow: Cells come only from other cells

5 Cell TheoryThe cell theory states that all living organisms are made of one or more cells, cells are the basic units of structure and function, and cells come only from pre-existing cells.

6 Cell Theory cont. Cellular Basis of LifeAll living things are made of organized parts, obtain energy from their surroundings, perform chemical reactions, change with time, respond to their environment, and reproduce.

7 The Cell Theory #1 All living things are made of 1 or more cells#2 Cells are the basic units of structure and function of an organism#3 Cells come only from the reproduction of existing cells (new cells come only from other cells)

8 Section 2 Introduction to CellsObjectives:Explain the relationship between cell shape and cell function.Identify the factor that limits cell size.Describe the three basic parts of a cell.Compare prokaryotic cells and eukaryotic cells.Analyze the relationship among cells, tissues, organs, organ systems, and organisms.

13 Cell PartsThe three basic parts of a cell are the plasma membrane, the cytoplasm, and the nucleus.

14 Cell Parts cont. Plasma MembraneThe cell’s outer boundary, called the plasma membrane (or the cell membrane), covers a cell’s surface and acts as a barrier between the inside and the outside of a cell.

15 Cell Parts cont. CytoplasmThe region of the cell that is within the plasma membrane and that includes the fluid, the cytoskeleton, and all of the organelles except the nucleus is called the cytoplasm.

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